Run your blue square and try not to crash.

It all started with one pixel,
only later chaos ensued.
The small red dot began to spread
throughout the matrix. Subsequent pixels became infected
and unable to perform their tasks.
The fate of the entire matrix seemed sealed,
when a resistant one appeared on the horizon
to the overwhelming red.
Perhaps all was not lost yet.
The blue pixel has gained allies
and set off on a journey diagonally across the screen.